The 54-year-old star received the top prize for her portrayal of Alzheimer's sufferer Alice Howland in gripping drama Still Alice, beating fellow actresses Reese Witherspoon, Rosamund Pike, Jennifer Aniston and Felicity Jones, as well as Cotillard, to to accolade.

And while the talented thespian graciously congratulated the other nominees in her category, she accidentally forgot to mention the French actress, who was nominated for he role in Two Days, One Night.

'She is exquisite': Upon realising the error of her ways, the 54-year-old star immediately took to her Twitter page to redeem herself, explaining she was 'mortified' at having left out the 'exquisite' actress

Upon realising the error of her ways, Julianne immediately took to her Twitter page to redeem herself, explaining she was 'mortified' at having left out the 'exquisite' actress.

She tweeted: 'i forgot to mention #MarionCotillard in my speech tonight and i am mortified. she is exquisite in everything + especially in #2days1night.'

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Julianne could be forgiven for her mishap, given that she was no doubt still buzzing after hearing she had been nominated for an Oscar in the same category.

The screeen star dazzled in a revealing black dress adorned with a sheer lace detail as she celebrated her Oscar nod by attending the 2015 Critics' Choice Awards at the Hollywood Palladium on Thursday evening.

Winner: Julianne scooped the gong for Best Actress at the Critics' Choice Awards on Thursday

'One thing I know is that I'm a girl's girl,' Julianne began in her acceptance speech, before giving a shout out to her fellow nominees Reese Witherspoon, Rosamund Pike, Jennifer Aniston and Felicity Jones.

'I am so inspired by you all and just honored to be in your company'.

Jennifer appeared to be particularly touched by her mention, as she seemed to be tearing up when Julianne said she felt her 'pain'.

Gracious: Moore said of her fellow nominees, 'I am so inspired by you all and just honored to be in your company'

Giddy: The star could barely contain herself as she walked up to the podium

No hard feelings: Later in the evening she posed with Jennifer Aniston for a snap during the ceremony

Another champion: Moore played catch up with Patrick Stewart

Julianne was positively chic in the fitted long sleeve sheath which put her cleavage prominently on display.

She had her fiery locks sleekly styled straight down to her shoulder with natural makeup on her alabaster complexion, dark lashings of mascara and a pale plum lipstick.

A pair of exquisite diamond chandelier earrings and an onyx manicure completed the stylish ensemble.

Fantastic: She up the sexiness as she took to the red carpet at the Critics' Choice Awards on Thursday

Making a statement: The 54-year-old continued to dazzle in a revealing black dress which featured a sheer lace panel that put her cleavage on display as she made her way into the Hollywood Palladium

Earlier that day, the talented actress couldn't help but beam as she revealed her reaction regarding her most recent Oscar nomination to red carpet host George Pennacchio.

‘I am stunned. It’s fantastic! When you’re 17 you say to your parents “I want to be an actor” that’s one thing,' the Still Alice star revealed.

'But after you’ve been doing it for so many years, to get an accolade like that, an Oscar nomination?! Is really something.’

Sleek: She was positively chic in the fitted long sleeve gown which flowed effortless down the blue carpet

Career moment: A pair of exquisite diamond chandelier earrings and an onyx manicure completed the stylish ensemble

Dramatic: The Still Alice star had her fiery locks sleekly styled straight down past her shoulders with natural makeup on her alabaster complexion, dark lashings of mascara and a pale plum lipstick

The Hollywood veteran received the news while flying to Los Angeles from her home in New York and disclosed who she called immediately.

‘The first person I told was my husband when I got off a plane this morning,' she said of the father of her two children, Bart Freundlich.

On Thursday she was up against Jennifer Aniston (Cake), Marion Cotillard (Two Days, One Night), Felicity Jones (The Theory Of Everything), Rosamund Pike (Gone Girl) and Reese Witherspoon (Wild).

Julianne already has two Critics' Choice Awards having previously won Best Actress for the 2002 film Far From Heaven and for her television work in the 2012 HBO movie Game Change.

It's a theme: Michelle Monaghan kept up the theme in a similar black lace frock